Ringing occurs when speakers are on 'Mute'

If you don't want Google Talk to automatically unmute your speakers when a call is coming in, follow these steps:
  1. Click 'Settings' at the top of your Friends list.
  2. Highlight 'Audio' along the left side of the dialogue box, and uncheck the box next to 'Unmute speaker and microphone when on a call.'
  3. Click 'OK.'
If you disable this option, make sure to manually unmute your speakers when you're ready to receive calls.